Error Upgrading Kernel With Yum

Gathering header information file(s) from server(s)
Server: CentOS-3.3 - Addons
Server: CentOS-3.3 - Base
Server: CentOS-3.3 - Extras
Server: CentOS-3.3 - Updates
Finding updated packages
Downloading needed headers
retrygrab() failed for:
http://sunsite.utk.edu/ftp/pub/linux...i386//headers/
squirrelmail-0-1.4.3a-7.EL3.centos.1.noarch.hdr
Executing failover method
failover: out of servers to try
Error getting file http://sunsite.utk.edu/ftp/pub/linux...os-3/3.3/updat
es/i386//headers/squirrelmail-0-1.4.3a-7.EL3.centos.1.noarch.hdr
[Errno 6] ERROR: Url Return no Content-Length - something is wrong